Accelerated Atmospheric Corrosion Of Copper And Copper Alloys

Sterling, Amanda J.; Atrens, Andrej; Smith, Ian

doi:10.1179/000705990799156391

Cited by 14 publications

(2 citation statements)

References 4 publications

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“…[83][84][85] Brochantite is a key factor in providing this low corrosion rates. Brochantite provides the blue green colour characteristic of copper roofs exposed for long periods (decades to centuries) to the atmosphere.…”

Section: Reaction Filmsmentioning

confidence: 99%

Recent Insights into the Mechanism of Magnesium Corrosion and Research Suggestions

Song¹,

Atrens²

2007

Adv Eng Mater

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281

121

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Magnesium (Mg) is the most reactive engineering material and corrosion protection continues to be an issue of great importance. [1][2][3][4] This note builds on prior reviews [1][2][3][4][5][6][7][8] and our research on Mg corrosion. [1,2, The corrosion performance of Mg alloys results from (1) the high intrinsic dissolution tendency of Mg, which is only weakly inhibited by corrosion product films and (2) the presence of impurities and second phases acting as local cathodes and thus causing local microgalvanic acceleration of corrosion.The corrosion mechanism includes all physical features and chemical reactions when metallic Mg is exposed to an environment. Our prior work [2,5,11,12] has indicated that the Mg corrosion mechanism has the following key points. In the general case, a partially protective film covers the surface of Mg and Mg dissolution occurs at breaks in this film. Hydrogen (H) evolution is associated with Mg dissolution in two separate ways. (a) An electrochemical reaction, Equation 1, balances the Mg dissolution reaction, Equation 2. (b) H is also produced directly by the reaction of Mg + with water, Equation 3.The overall reaction consumes H + and produces OH -, i.e. the pH increases, which favours the formation of Mg hydroxide film by the precipitation reaction. Mg has a negative corrosion potential, with a slightly more negative pitting potential, in solutions of practical importance like 3 % NaCl. The chance development of areas of localized corrosion leads to undermining and falling out of particles of Mg, even for the corrosion of pure Mg. New Insights: Mg +There continues to be some controversy as to the existence of Mg + as an intermediate in the reaction sequence between metallic Mg and Mg 2+ , the stable Mg ionic species in aqueous solutions. The evidence in support of the existence of Mg + is strong but circumstantial. The evidence in favor is based on the fact that the simplest possible reaction sequence, which includes Reactions 2 and 3, is consistent with all the experimental evidence, particularly the electrochemical impedance spectroscopy. [12] It is also supported by the observations of Song and co-workers [5,16,19] that the Mg corrosion mechanism involves "anodic H evolution" which is different to "cathodic H evolution".Negative Difference Effect (NDE): Mg has an exceedingly strange phenomenon, the negative difference effect (NDE). The NDE continues to receive considerable discussion. The NDE has been defined in our previous publications [1,2,5,11,12] in terms of the difference D:where I s is the spontaneous rate of the H evolution reaction (HER) on the Mg surface at the free corrosion potential, I H,m is the measured HER rate for an applied galvanostatic current I appl , which is equal to I appl I Mg;m À I H;m 5where I Mg,m is the measured rate of Mg corrosion. For most metals like Fe and Zn, in an acid solution, when the potential is increased, the anodic dissolution rate increases and the cathodic H evolution rate decreases. For these cases, D is greater than zero because I ...

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Section: Reaction Filmsmentioning

confidence: 99%

Recent Insights into the Mechanism of Magnesium Corrosion and Research Suggestions

Song¹,

Atrens²

2007

Adv Eng Mater

Self Cite

281

121

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“…These Cu-Zn alloys can be ranked in the order of decreasing atmospheric corrosion resistance as Cu-37Zn, Cu-30Zn and Cu-27Zn. The weight loss data (figure 4) reveals that Cu corrosion is related to atmospheric pollution, and in general, alloying does not decrease the weight loss of Cu alloys [52][53][54][55].…”

Section: Kinetics Of Corrosion Processmentioning

confidence: 99%

Corrosion behavior of metals and alloys in marine-industrial environment

Natesan

Selvaraj

Manickam³

et al. 2008

Science and Technology of Advanced Materials

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This work deals with atmospheric corrosion to assess the degrading effects of air pollutants on ferrous and non-ferrous metals and alloys, which are mostly used as engineering materials. An exposure study was conducted in the Tuticorin port area located on the east coast of South India, in the Gulf of Mannar with Sri Lanka to the southeast. Common engineering materials, namely mild steel, galvanized iron, Zn, Al, Cu and Cu-Zn alloys (Cu-27Zn, Cu-30Zn and Cu-37Zn), were used in the investigation. The site was chosen where the metals are exposed to marine and industrial atmospheres. Seasonal 1 to 12 month corrosion losses of these metals and alloys were determined by a weight loss method. The weight losses showed strong corrosion of mild steel, galvanized iron, Cu and Zn and minor effect on Al and Cu-Zn alloys. Linear regression analysis was conducted to study the mechanism of corrosion. The composition of corrosion products formed on the metal surfaces was identified by x-ray diffraction and Fourier transform infrared spectroscopy.

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Copper Alloys, Wrought Copper and Wrought Copper Alloys

Breedis

Caron

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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The mechanical and physical properties of wrought copper and wrought copper alloys are surveyed according to alloy composition and the temper to which the alloys are processed. Properties important for manufacturing include: formability, bending, drawing, and its analysis; springback; joining, welding, brazing, and soldering; resistances to softening and hydrogen embrittlement; and machinability. Properties relating to performance of manufactured products are strength, electrical and thermal conductivities, solderability, and resistances to stress relaxation, fatigue failure, and corrosion. Alloy designations are defined and tensile properties of alloys within the several compositional groups are provided. Wrought copper (93.3% minimum copper); the high coppers (no less than 96% copper); zinc and tin brasses; tin, aluminum, and silicon bronzes; specially modified copper‐zinc alloys; copper nickels; and nickel silvers are discussed together with the several commercially available precipitation hardenable alloys that are distributed among the compositional groupings. Selected applications and the relative pricing of commercial alloys are given.

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Accelerated Atmospheric Corrosion Of Copper And Copper Alloys

Cited by 14 publications

References 4 publications

Recent Insights into the Mechanism of Magnesium Corrosion and Research Suggestions

Recent Insights into the Mechanism of Magnesium Corrosion and Research Suggestions

Corrosion behavior of metals and alloys in marine-industrial environment

Copper Alloys, Wrought Copper and Wrought Copper Alloys

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